[(2R,3S,5R)-5-(2,4-dioxopyrimidin-1-yl)-2-(hydroxymethyl)oxolan-3-yl] phosphate
[(2R,3S,5R)-5-(2,4-dioxopyrimidin-1-yl)-2-(hydroxymethyl)tetrahydrofuran-3-yl] phosphate
[(2R,3S,5R)-5-(2,4-dioxo-1-pyrimidinyl)-2-(hydroxymethyl)-3-tetrahydrofuranyl] phosphate
[(2R,3S,5R)-5-(2,4-diketopyrimidin-1-yl)-2-methylol-tetrahydrofuran-3-yl] phosphate